Deep prophylaxis, so typical for Carlsen, no matter what the time control is.
23... h7h6 Keymer takes the g5-square away from the white rooks. 24. a2a4  24... g6g4 This was Keymer's plan. He is now looking for nice central counter-strikes. 25. g2g3  25... a7a6 Preparing the coming sacrifice.